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Xi J, Wang D, Hu J, Shen H, Wang T, Zhang Z. Rearrangement of 2-(benzofuran-2-yl)-3-phenylpyridines via photoinduced 6π-electrocyclization. Org Biomol Chem 2023; 21:7188-7193. [PMID: 37642152 DOI: 10.1039/d3ob00883e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
By photoinduced 6π-electrocyclization of 2-(benzofuran-2-yl)-3-phenylpyridine derivatives 1, a method for the synthesis of trans-dihydrobenzo[f]quinolines 2, cis-dihydrobenzo[f]quinolines 3 and 8b-methyl-1,8b-dihydrobenzo[f]quinolines 4 was developed. Irradiation of 2-(benzofuran-2-yl)-3-phenylpyridine 1 in acetone-H2O (5 : 1, v/v) with a 313 nm UV lamp under an argon atmosphere at room temperature successfully yielded 2, which was further converted into 3 at elevated temperature (200 °C) in glycerol. However, irradiating 2-(3-methylbenzofuran-2-yl)-3-phenylpyridines 1 in CH2Cl2 with a 254 nm UV lamp gave 4 in good yields. The syntheses of 2, 3 and 4via the 6π-electrocyclization rearrangement of 1 not only offer high atom efficiency but also do not require transition metal catalysts or additives.
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Affiliation(s)
- Jin Xi
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
| | - Ding Wang
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
| | - Jinxia Hu
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
| | - Huan Shen
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
| | - Tao Wang
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
| | - Zunting Zhang
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
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2
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Farajpour B, Alizadeh A. Recent advances in the synthesis of cyclic compounds using α,α-dicyanoolefins as versatile vinylogous nucleophiles. Org Biomol Chem 2022; 20:8366-8394. [DOI: 10.1039/d2ob01551j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This article provides a review of the applications of α,α-dicyanoolefins as versatile vinylogous nucleophiles in the synthesis of various cyclic compounds, covering the literature from the past 13 years.
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Affiliation(s)
- Behnaz Farajpour
- Department of Chemistry, Tarbiat Modares University, P. O. Box 14115-175, Tehran, Iran
| | - Abdolali Alizadeh
- Department of Chemistry, Tarbiat Modares University, P. O. Box 14115-175, Tehran, Iran
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3
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Liu XY, Qin Y. Recent advances in the total synthesis of monoterpenoid indole alkaloids enabled by asymmetric catalysis. GREEN SYNTHESIS AND CATALYSIS 2021. [DOI: 10.1016/j.gresc.2021.10.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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4
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Zhao S, Sirasani G, Andrade RB. Aspidosperma and Strychnos alkaloids: Chemistry and biology. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2021; 86:1-143. [PMID: 34565505 DOI: 10.1016/bs.alkal.2021.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Abstract
Of Nature's nearly 3000 unique monoterpene indole alkaloids derived from tryptophan, those members belonging to the Aspidosperma and Strychnos families continue to impact the fields of natural products (i.e., isolation, structure determination, biosynthesis) and organic chemistry (i.e., chemical synthesis, methodology development) among others. This review covers the biological activity (Section 2), biosynthesis (Section 3), and synthesis of both classical and novel Aspidosperma (Section 4), Strychnos (Section 5), and selected bis-indole (Section 6) alkaloids. Technological advancements in genetic sequencing and bioinformatics have deepened our understanding of how Nature assembles these intriguing molecules. The proliferation of innovative synthetic strategies and tactics for the synthesis of the alkaloids covered in this review, which include contributions from over fifty research groups from around the world, are a testament to the creative power and technical skills of synthetic organic chemists. To be sure, Nature-the Supreme molecular architect and source of a dazzling array of irresistible chemical logic puzzles-continues to inspire scientists across multiple disciplines and will certainly continue to do so for the foreseeable future.
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Affiliation(s)
- Senzhi Zhao
- Department of Chemistry, Temple University, Philadelphia, PA, United States
| | | | - Rodrigo B Andrade
- Department of Chemistry, Temple University, Philadelphia, PA, United States
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5
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Ghosh AK, Yadav M. Highly Diastereoselective Intramolecular Asymmetric Oxidopyrylium-olefin [5 + 2] Cycloaddition and Synthesis of 8-Oxabicyclo[3.2.1]oct-3-enone Containing Ring Systems. J Org Chem 2021; 86:8127-8142. [PMID: 34015224 DOI: 10.1021/acs.joc.1c00600] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have the investigated base mediated asymmetric intramolecular oxidopyrylium-alkene [5 + 2]-cycloaddition reaction which resulted in the synthesis of functionalized tricyclic ring systems containing an 8-oxabicyclo[3.2.1]octane core. Intramolecular cycloaddition constructed two new rings, three new stereogenic centers, and provided a tricyclic cycloadduct with high diastereoselectivity and isolated yield. We incorporated an α-chiral center and an alkoxy alkene tether on the substrates and examined the effect of the size of alkyl groups and alkene tether length on diastereoselectivity. The requisite substrates for the oxidopyrylium-alkene cycloaddition reaction were synthesized in a few steps involving alkylation of optically active α-hydroxy amide, furyllithium addition, reduction of resulting ketone, and Achmatowicz reaction followed by acylation of a lactol intermediate. We have proposed stereochemical models for the [5 + 2] cycloaddition reaction via the oxidopyrylium ylide. Interestingly, the alkoxy substituent on the stereocenter and the chain length are responsible for the degree of stereoselectivity of the cycloadduct.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Monika Yadav
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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6
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Ma L, Feng W, Shang H, Lin X, Xi Y. Tunable photochemical 6π heterocyclization reactions mediated by a boron Lewis acid. NEW J CHEM 2021. [DOI: 10.1039/d1nj03218f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The regulation effect of boron Lewis acid catalyst on the photoinduced 6π heterocyclization was investigated by using multi-configurational ab initio calculations.
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Affiliation(s)
- Lishuang Ma
- Department of Chemistry, College of Science, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Wenxu Feng
- Department of Chemistry, College of Science, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Hongyan Shang
- Department of Chemistry, College of Science, China University of Petroleum (East China), Qingdao, 266580, P. R. China
- State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Xufeng Lin
- Department of Chemistry, College of Science, China University of Petroleum (East China), Qingdao, 266580, P. R. China
| | - Yanyan Xi
- State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China), Qingdao, 266580, P. R. China
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China
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7
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Martin G, Angyal P, Egyed O, Varga S, Soós T. Total Syntheses of Dihydroindole Aspidosperma Alkaloids: Reductive Interrupted Fischer Indolization Followed by Redox Diversification. Org Lett 2020; 22:4675-4679. [PMID: 32497431 PMCID: PMC7467818 DOI: 10.1021/acs.orglett.0c01472] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Indexed: 01/22/2023]
Abstract
We report a novel reductive interrupted Fischer indolization process for the concise assembly of the 20-oxoaspidospermidine framework. This rapid complexity generating route paves the way toward various dihydroindole Aspidosperma alkaloids with different C-5 side chain redox patterns. The end-game redox modulations were accomplished by modified Wolff-Kishner reaction and photo-Wolff rearrangement, enabling the total synthesis of (-)-aspidospermidine, (-)-limaspermidine, and (+)-17-demethoxy-N-acetylcylindrocarine and the formal total synthesis of (-)-1-acetylaspidoalbidine.
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Affiliation(s)
- Gábor Martin
- Institute
of Organic Chemistry, Research Centre for
Natural Sciences, 2 Magyar tudósok krt., Budapest, H-1117, Hungary
| | - Péter Angyal
- Institute
of Organic Chemistry, Research Centre for
Natural Sciences, 2 Magyar tudósok krt., Budapest, H-1117, Hungary
| | - Orsolya Egyed
- Instrumentation
Center, Research Centre for Natural Sciences, 2 Magyar tudósok krt., Budapest, H-1117, Hungary
| | - Szilárd Varga
- Institute
of Organic Chemistry, Research Centre for
Natural Sciences, 2 Magyar tudósok krt., Budapest, H-1117, Hungary
| | - Tibor Soós
- Institute
of Organic Chemistry, Research Centre for
Natural Sciences, 2 Magyar tudósok krt., Budapest, H-1117, Hungary
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Usman M, Hu X, Liu W. Recent Advances and Perspectives in the Synthesis and Applications of Tetrahydrocarbazol‐4‐ones†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000029] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Muhammad Usman
- Sauvage Center for Molecular Sciences; Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education); College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 China
| | - Xu‐Dong Hu
- Sauvage Center for Molecular Sciences; Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education); College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 China
| | - Wen‐Bo Liu
- Sauvage Center for Molecular Sciences; Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education); College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 China
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9
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Feng J, Chen Y, Qin W, Huang Y. Phosphine-Catalyzed (3 + 2)/(3 + 2) Sequential Annulation of γ-Vinyl Allenoates: Access to Fused Carbocycles. Org Lett 2020; 22:433-437. [PMID: 31873035 DOI: 10.1021/acs.orglett.9b04176] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first (3 + 2)/(3 + 2) sequential annulation of γ-vinyl allenoates with alkylidenemalononitriles enabled by phosphine catalysis has been reported. A broad range of structurally dense tetra- and penta-substituted bicyclic[3,3,0]octene derivatives, containing a quaternary center and three sequential stereogenic center, were synthesized in good to excellent yields. In this approach, three new C-C bonds are formed in one pot, and εC and αC of γ-vinyl allenoate are two electrophilic centers, whereas its γC exhibits nucleophilic reactivity.
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Affiliation(s)
| | | | | | - You Huang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China.,Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071 , China
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